Note 8 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Payroll expenses and tax payable	$ 232,000	$ 556,000
Commission and bonuses payable and general accrued liabilities	1,333,000	904,000
	$ 1,565,000	$ 1,460,000